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#1
09-21-2008, 10:03 PM
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code p1668 help
I am working on a 96 that is throwing the p1668 code it says pcm-idm communication. I have tested the pcm and the idm on different trucks and they are fine. What other components can I check?
__________________
01 F350 cc dually 6sp conversion 00 F250 2.6 puller early 99 F350 2wd daily driver 
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#2
09-23-2008, 05:08 PM
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Re: code p1668 help
DTC P1668 and P1670 indicates that a communication error has occurred between the PCM and the IDM.
Possible causes: Open fuse IDM relay Open or shorted IDM enable circuit Open/short in EF circuit Open/short in FDCS circuit IDM powering circuits PCM Check for other codes
__________________
Rick.... Supporter/End user of ShiftSolutions THE CURE E4/4R Trans Control. Helping Cancer patients and families www.fordtransmissioncure.com Special thanks to RacerX USA www.racerxpower.com
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#3
09-24-2008, 12:18 AM
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Re: code p1668 help
no other codes. I changed around the relays and the truck srarted, but now it has a short in it. The wait to start light flashes constantly and the lights in the dash flash. It's almost like you are turning the key on and off really fast.
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#4
09-24-2008, 12:43 AM
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Re: code p1668 help
Just for drill disconnect the fuel heater. They like to fail and short on out the PCM circuit but I have not read of anyone having this exact set of problems. I would also be checking out those relays.
Tom
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#5
09-25-2008, 12:46 AM
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Re: code p1668 help
I will try new relays tomorrow
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#6
09-27-2008, 02:26 AM
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Re: code p1668 help
It was the relay.
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96 F250 4X4 AUTO
Linear Mode
